This easy-to-grow annual (Calendula officinalis) features cheery orange and bright yellow blooms that light up the garden from spring through summer in cold climates, and from late fall through spring where winters are mild. The narrow leaves are sticky and slightly aromatic. Plants grow 1 to 2 feet high and 1 to 1 1/2 feet wide, with dwarf strains reaching just 15 inches. Pot marigold grows in just about any soil type, as long as the drainage is fast. Water regularly and encourage blooming by fertilizing every six to eight weeks and deadheading.